Elm (Ulmus, Zelkova)
Elm bonsai are robust, easy-care bonsai for beginners. They forgive many mistakes in bonsai care. This bonsai tree species is very suitable for styling. The frequently offered Chinese elm can be kept both as an indoor bonsai and as a cold house bonsai. The other elm species and the Zelkova bonsai (Zelkova serrata) are hardy outdoor bonsai.
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Care in a nutshell
Wiring: Applying the bonsai wire is easily possible because the bendable branches do not break so easily
Fertilisation: From March to September, fertilize generously with commercially available bonsai fertilizers such as Biogold, Hanagokoro or liquid fertilizer
Irrigation: Water a lot in summer. Keep moderately moist in winter.
Pruning: Cut back vigorously 2-3 times from May to early August with a sharp bonsai scissor (the wood is very soft). Stronger branches are removed with pliers for bonsai. Seal large incisions with wound sealant
Overwintering: As an indoor bonsai (Chinese elm) hibernate in a very light and as cool place as possible. However, it also tolerates temperatures below 0°C very well. The other elm species can be well overwintered in an unheated greenhouse
Repotting: Repot an elm bonsai approx. every 3-4 years at beginning of march in a well-drained bonsai soil (for example Akadama) with strong root-cut